From fe21c4c52221585c507211b4c30570b0f2e93c85 Mon Sep 17 00:00:00 2001
From: Michael Woerister <michaelwoerister@posteo>
Date: Wed, 10 Jan 2018 18:23:50 +0100
Subject: [PATCH] Add -Ztime-passes line for dep-graph loading.

---
 src/librustc_driver/driver.rs | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/librustc_driver/driver.rs b/src/librustc_driver/driver.rs
index 51c61005bdd2c..5282895d22ae8 100644
--- a/src/librustc_driver/driver.rs
+++ b/src/librustc_driver/driver.rs
@@ -889,10 +889,11 @@ pub fn phase_2_configure_and_expand<F>(sess: &Session,
     let dep_graph = match future_dep_graph {
         None => DepGraph::new_disabled(),
         Some(future) => {
-            let prev_graph = future
-                .open()
-                .expect("Could not join with background dep_graph thread")
-                .open(sess);
+            let prev_graph = time(time_passes, "blocked while dep-graph loading finishes", || {
+                future.open()
+                      .expect("Could not join with background dep_graph thread")
+                      .open(sess)
+            });
             DepGraph::new(prev_graph)
         }
     };